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    Question

    What is the main function of red blood cells (RBCs) in

    human blood?
    A To carry oxygen Correct Answer Incorrect Answer
    B To fight infections Correct Answer Incorrect Answer
    C To produce hormones Correct Answer Incorrect Answer
    D To help in blood clotting Correct Answer Incorrect Answer

    Solution

    The main function of red blood cells is to carry oxygen from the lungs to all parts of the body and bring some carbon dioxide back to the lungs. Red blood cells contain hemoglobin, a protein that can bind oxygen molecules easily.

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